

“Those who cannot change their minds cannot change anything.”
Everybody's Political What's What? (ebook, must be borrowed) https://openlibrary.org/books/OL24979564M/Everybody's_political_what's_what (1944), Chapter XXXVII: Creed and Conduct, p. 330
1940s and later
Variant: Progress is impossible without change; and those who cannot change their minds cannot change anything.
Context: Progress is impossible without change; and those who cannot change their minds cannot change anything. Creeds, articles, and institutes of religious faith ossify our brains and make change impossible. As such they are nuisances, and in practice have to be mostly ignored.